Powdered mustard, also known as ground mustard, is a common spice used in many recipes. However, there are several synonyms that can be used in place of powdered mustard. One popular variant is mustard flour, which is made from ground mustard seeds. Another synonym is dry mustard, as it is the same as powdered mustard and has a longer shelf life. Mustard powder is also a suitable replacement for powdered mustard, as it is made from ground mustard seeds and has a similar taste. Additionally, mustard seasoning is another synonym for powdered mustard, as it adds the same flavor to dishes. Overall, these synonyms offer variation and versatility to the use of powdered mustard in cooking and recipes.